Address regression bug report, revert the PaintInfo rect member function.

Source/core/rendering/PaintInfo.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 36 matching lines @@
 
 /*
  * Paint the object and its children, clipped by (x|y|w|h).
  * (tx|ty) is the calculated position of the parent
  */
 struct PaintInfo {
     PaintInfo(GraphicsContext* newContext, const IntRect& newRect, PaintPhase newPhase, PaintBehavior newPaintBehavior,
         RenderObject* newPaintingRoot = 0, RenderRegion* region = 0, ListHashSet<RenderInline*>* newOutlineObjects = 0,
         OverlapTestRequestMap* overlapTestRequests = 0, const RenderLayerModelObject* newPaintContainer = 0)
         : context(newContext)
+        , rect(newRect)
         , phase(newPhase)
         , paintBehavior(newPaintBehavior)
         , paintingRoot(newPaintingRoot)
         , renderRegion(region)
         , overlapTestRequests(overlapTestRequests)
         , m_paintContainer(newPaintContainer)
         , m_outlineObjects(newOutlineObjects)
-        , m_rect(newRect)
     {
     }
 
     void updatePaintingRootForChildren(const RenderObject* renderer)
     {
         if (!paintingRoot)
             return;
 
         // If we're the painting root, kids draw normally, and see root of 0.
         if (paintingRoot == renderer) {
@@ skipping 12 matching lines @@
     bool skipRootBackground() const { return paintBehavior & PaintBehaviorSkipRootBackground; }
     bool paintRootBackgroundOnly() const { return paintBehavior & PaintBehaviorRootBackgroundOnly; }
 
     void applyTransform(const AffineTransform& localToAncestorTransform)
     {
         if (localToAncestorTransform.isIdentity())
             return;
 
         context->concatCTM(localToAncestorTransform);
 
-        if (m_rect == infiniteRect())
+        if (rect == infiniteRect())
             return;
 
-        m_rect = localToAncestorTransform.inverse().mapRect(m_rect);
+        rect = localToAncestorTransform.inverse().mapRect(rect);
     }
 
     static IntRect infiniteRect() { return IntRect(LayoutRect::infiniteRect()); }
     const RenderLayerModelObject* paintContainer() const { return m_paintContainer; }
 
     ListHashSet<RenderInline*>* outlineObjects() { return m_outlineObjects; }
     void setOutlineObjects(ListHashSet<RenderInline*>* objects) { m_outlineObjects = objects; }
 
-    const IntRect& rect() const { return m_rect; }
-    IntRect& rect() { return m_rect; }
-    void setRect(const IntRect& rect) { m_rect = rect; }
-
     // FIXME: Introduce setters/getters at some point. Requires a lot of changes throughout rendering/.
     GraphicsContext* context;
+    IntRect rect;
     PaintPhase phase;
     PaintBehavior paintBehavior;
     RenderObject* paintingRoot; // used to draw just one element and its visual kids
     RenderRegion* renderRegion;
     OverlapTestRequestMap* overlapTestRequests;
 
 private:
 
     const RenderLayerModelObject* m_paintContainer; // the layer object that originates the current painting
     ListHashSet<RenderInline*>* m_outlineObjects; // used to list outlines that should be painted by a block with inline children
-    IntRect m_rect;
 };
 
 } // namespace WebCore
 
 #endif // PaintInfo_h